New Customers Per Day

A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

medium

Seniority

L5

Problem

For each calendar date, how many customers placed their very first order on that day? A customer's first-order date is the earliest order they have in the table.

Summary

Count users whose first order falls on each date.

Practice This Problem

Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a real database and grades it automatically.